Income Taxes - Deferred Tax Assets (Liabilities) (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Plant, property and equipment	$ (83)	$ (52)
Intangibles	(41)	(51)
Inventories	51	61
Deferred gains	469	396
Investments	61	141
Receivables (net of reserves)	(32)	(30)
Accrued expenses and other reserves	139	117
Employee benefits	76	67
Net operating loss, capital loss and tax credit carryforwards	208	269
Other	103	107
Total	951	1,025
Less valuation allowance	(238)	(280)
Deferred income taxes	$ 713	$ 745